Honeycomb RhI3 Flakes with High Environmental Stability for Optoelectronics

Fakun Wang; Zhuang Zhang; Yue Zhang; Anmin Nie; Wei Zhao; Dong Wang; Fuqiang Huang; Tianyou Zhai

doi:10.1002/adma.202001979

Honeycomb RhI₃ Flakes with High Environmental Stability for Optoelectronics

Adv Mater. 2020 Jun;32(25):e2001979. doi: 10.1002/adma.202001979. Epub 2020 May 17.

Authors

Fakun Wang¹, Zhuang Zhang^{2

3}, Yue Zhang¹, Anmin Nie⁴, Wei Zhao², Dong Wang², Fuqiang Huang^{2

5}, Tianyou Zhai^{1

6}

Affiliations

¹ State Key Laboratory of Material Processing and Die and Mould Technology, School of Material Sciences and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
² State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
³ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
⁴ Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P. R. China.
⁵ State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
⁶ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, P. R. China.

PMID: 32419271
DOI: 10.1002/adma.202001979

Abstract

The emerging 2D layered transition metal trihalides (MX₃ ) have attracted extremely high interest given their exceptional structural and physical properties. Continuing to extend the library of 2D MX₃ is essential for exploring new physical phenomena and enabling new functionality. Herein, the optical and electrical properties and the photodetection behavior of atomically thin RhI₃ flakes exfoliated from bulk crystals are reported. This compound exhibits superior air and thermal stability, as well as thickness-dependent bandgap from 1.1 (18L) to 1.4 eV (2L). Field-effect transistors based on the few-layer RhI₃ flakes display n-type semiconducting behavior with competitive mobility of 2.5 cm² V^-1 s^-1 and ON/OFF current ratio of 4 × 10⁴ . Importantly, the outstanding responsivity of 11.5 A W^-1 and high specific detectivity of 2 × 10¹⁰ Jones are recorded from the RhI₃ photodetectors under 980 nm illumination at room temperature in air. These findings indicate a variety of potential applications of atomically thin RhI₃ flakes in future 2D-material-based electronic and optoelectronic devices.

Keywords: 2D materials; RhI3; field-effect ttansistors; photodetectors; transition metal trihalides.

Abstract

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